VDJPedia

Q. I am unable to save Online Music songs in a playlistYou will need to cache the songs to your hard disk first before adding them to the playlist. A playlist cannot contain live streamed files (If you do this, these will show up as a stream ID instead of the standard Title/Artist format when you next load the playlist.)

To avoid this from happening it is strongly recommended to cache (download) the file first. To cache a song, simply right-click on it in the Online Music search results and choose the option to Download to cache. Once the song has finished downloading, click on the track from the browser or the Online Music Offline Cache folder and drag it to the playlist.